Iljina S.S. Influence of crippling of double-t buntons elements on the strength of mine shafts reinforcement

Details

Parent Category: Geo-Technical Mechanics, 2017

Category: Geo-Technical Mechanics, 2017, Issue 137

 

Geoteh. meh. 2017, 137, 107-116

INFLUENCE OF CRIPPLING OF DOUBLE-T BUNTONS ELEMENTS ON THE STRENGTH OF MINE SHAFTS REINFORCEMENT

¹Iljina S.S.

¹SHEI «NMU»

UDC 622.67.531

Abstract. In the article, the author poses and solves a problem of modeling defects of buntons in the shaft equipment with box guides. Results of surveys showed typical kinds of defects in the buntons at their long-term operation in conditions of aggressive mine environment. With the help of solid-modeling method in the SolidWorks-Simulation system, the author investigated effect of vertical double-T section crippling, which occurs in the bearing beam in the point of its embedding into the shaft lining at preserved standard geometric parameters of horizontal racks while being under the effect of frontal dynamic load caused by the cage, on its stressed-deformed state. It is shown that in the "bunton - guide" system with defect-free bunton, change of the point of force application practically does not lead to significant increase of stresses in concentration zones near the lining and under the guide. Besides, in case when rack is crippled near the lining (up to 0.5 m), contact load applied to the guide in the point of its fixing to the bunton also does not cause any significant increase of stresses in the concentrators. At the same time, contact force applied to the span of the guide, which, due to its bending, causes twisting of the bunton around the longitudinal axis, sharply changes stress-strain state of its horizontal bridges near the hole-defect: stress concentration is 1.5-1.8 times higher in comparison with the defect-free bunton. This fact shows that loss of the cross section in the double-T rack in the area with intensive inflow of aggressive water into the shafts with significant disturbances of the guide verticality, which cause increase of dynamic loads, is a very critical factor, which increases risk of spontaneous destruction of the bearing buntons and derailing of cage.

Keywords: mine lift, shaft equipment, profile of rail guides, wear of rail guides, cage-shaft equipment” system

 

REFERENCES

1. Edinye pravila bezopasnjsti pri razrabotke rudnykh, nerudnykh i rossypnykh mestorozhdeniy podzemnym sposobom [Unified safety rules in the development of ore, non-ore and placer deposits with underground method] (1977), Nedra, Moscow, SU.

2. Iljin, S.R., Iljina, S.S. and Samusya, V.I. (2014), Mekhanika shakhtnogo podyema [Mechanics of mine hoist], Dnepropetrovsk, Ukraine.

3. Ministry of Social Politics of Ukraine (2017), Pravyla bezpeky pid chas rozrobky rodovyshch rudnykh ta nerudnykh korysnykh kopalyn pidzemnym sposobom [Safety rules for the development of ore deposits and nonmetallic minerals underground], (2017), Official Bulletin of Ukraine dated March 17, Vol. 22, Kiev, Ukraine.

4. Iljina, S.S. (2010), «Experimental studies of stiffness of roller directors, reinforcement and mathematical modeling of the influence of incomplete contact of side rollers with guides on oscillations of mine lifting vessel», Steel ropes, no. 10, pp. 79 – 102.

5. Dubinin, M.V. and Dvornikov, V.I. (2014), «Finite element modeling of the stress-strain state of streight reinforcement of shafts under the action of operating loads on the side of lifting vessels», in Aktualnye problemy povysheniya effektivnosti i bezopasnosti ekspluatatsii gorno-shakhtnogo i neftepromyslovogo oborudovaniya [Actual problems of increasing the efficiency and safety of mining and oilfield equipment operation], Perm, Russia, pp. 55 – 60.

 

About the author

Iljina Svetlana Sergeevna, Candidate of Technical Sciences (Ph. D.), Associate Professor in the Department of Mining Mechanics, State Higher Educational Institution «National Mining University» (SHEI “NMU”), Dnepr, Ukraine,, This email address is being protected from spambots. You need JavaScript enabled to view it.

• < Prev
• Next >